You should have her take it back to where she got the tires done and have them look over it. Having a professional LOOK at it and examine the problem is always better than guessing until you might happen to hit the right one. Also, if they're telling you that your Tie rod ENDS are bad, it could be what's causing the clunk because there's nothing holding the wheel in control as weight shifts. Have also seen a loose upper control arm cause this, but I don't see how the tire place would have missed that. If I had to take a WILD guess, I'd guess it's your Tie rod ends. With how many of them I see bad in a single day, it wouldn't surprise me.

Oh, and if the Tie-rod/tie-rod ends are bad, your alignment won't stick (If you even had one) and your tires will wear significantly faster. Best of all you won't get a mileage warranty since you knew of the issue when the tires were installed. Might wanna have that looked at.